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IPY View Angle Field
The required View Angle field is for specifying the look angle between
the camera and the Earth. A value of "Nadir" means that the camera is looking
virtually straight down at the Earth. A value of "Oblique" means that the
camera is looking at the Earth with a noticible angle but not so great that the
horizon is visible. A value of "Limb" means that the look angle is such that
the horizon is visible with some Earth in the foreground. A value of "Upper
Atmosphere" means that most or all of the picture is above the horizon.
This value is used only for helping us compose our photography request to the crew.
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